Hello!
I wanted to suggest a feature that is already present in iCloud Keychain where when you click on a password field, on MacBooks with Touch Bars, three or four possible password fills for that site appear on the Touch Bar. Once you click which email account’s password to fill, you unlock the auto fill with Touch ID. This is a great alternative to clicking on the button to the right of the password field and selecting from a drop menu, as this button is often covered by a lot of site’s “show password” button. Let me know what you think and if there’s any clarification I could provide!